/** * @license * Copyright 2020 Google LLC. All Rights Reserved. * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * ============================================================================= */ import { buffer } from '@tensorflow/tfjs-core'; export function pool(xValues, xShape, dtype, strides, convInfo, poolType) { const strideHeight = convInfo.strideHeight; const strideWidth = convInfo.strideWidth; const dilationHeight = convInfo.dilationHeight; const dilationWidth = convInfo.dilationWidth; const effectiveFilterHeight = convInfo.effectiveFilterHeight; const effectiveFilterWidth = convInfo.effectiveFilterWidth; const padTop = convInfo.padInfo.top; const padLeft = convInfo.padInfo.left; const initialValue = (poolType === 'max' ? Number.NEGATIVE_INFINITY : Number.POSITIVE_INFINITY); const output = buffer(convInfo.outShape, dtype); const outputVals = output.values; const outputBatchStrides = convInfo.outShape[1] * convInfo.outShape[2] * convInfo.outShape[3]; const outputRowStrides = convInfo.outShape[2] * convInfo.outShape[3]; const outputColStrides = convInfo.outShape[3]; for (let b = 0; b < convInfo.batchSize; ++b) { const outputBatchOffset = b * outputBatchStrides; const inputBatchOffset = b * strides[0]; for (let d = 0; d < convInfo.inChannels; ++d) { for (let yR = 0; yR < convInfo.outHeight; ++yR) { const xRCorner = yR * strideHeight - padTop; const xRMin = Math.max(0, xRCorner); const xRMax = Math.min(convInfo.inHeight, effectiveFilterHeight + xRCorner); const outputRowOffset = outputBatchOffset + yR * outputRowStrides; for (let yC = 0; yC < convInfo.outWidth; ++yC) { const xCCorner = yC * strideWidth - padLeft; const xCMin = Math.max(0, xCCorner); const xCMax = Math.min(convInfo.inWidth, effectiveFilterWidth + xCCorner); let minMaxValue = initialValue; let avgValue = 0; let count = 0; for (let xR = xRMin; xR < xRMax; xR += dilationHeight) { const xROffset = inputBatchOffset + xR * strides[1]; for (let xC = xCMin; xC < xCMax; xC += dilationWidth) { const xCOffset = xROffset + xC * strides[2]; const pixel = xValues[xCOffset + d]; if ((poolType === 'max' && pixel > minMaxValue)) { minMaxValue = pixel; } else if (poolType === 'avg') { avgValue += pixel; count++; } } if (isNaN(minMaxValue)) { break; } } const outputOffset = outputRowOffset + yC * outputColStrides + d; outputVals[outputOffset] = poolType === 'avg' ? avgValue / count : minMaxValue; } } } } return output; } export function maxPoolPositions(xValues, xShape, dtype, convInfo, flattenPositions = false, includeBatchInIndex = false) { const maxPositions = buffer(convInfo.outShape, 'int32'); const strideHeight = convInfo.strideHeight; const strideWidth = convInfo.strideWidth; const dilationHeight = convInfo.dilationHeight; const dilationWidth = convInfo.dilationWidth; const effectiveFilterHeight = convInfo.effectiveFilterHeight; const effectiveFilterWidth = convInfo.effectiveFilterWidth; const padTop = convInfo.padInfo.top; const padLeft = convInfo.padInfo.left; const xBuf = buffer(xShape, dtype, xValues); for (let b = 0; b < convInfo.batchSize; ++b) { for (let d = 0; d < convInfo.inChannels; ++d) { for (let yR = 0; yR < convInfo.outHeight; ++yR) { const xRCorner = yR * strideHeight - padTop; let xRMin = xRCorner; while (xRMin < 0) { xRMin += dilationHeight; } // const xRMin = Math.max(0, xRCorner); const xRMax = Math.min(convInfo.inHeight, effectiveFilterHeight + xRCorner); for (let yC = 0; yC < convInfo.outWidth; ++yC) { const xCCorner = yC * strideWidth - padLeft; let xCMin = xCCorner; while (xCMin < 0) { xCMin += dilationWidth; } const xCMax = Math.min(convInfo.inWidth, effectiveFilterWidth + xCCorner); let maxValue = Number.NEGATIVE_INFINITY; let maxPosition = -1; for (let xR = xRMin; xR < xRMax; xR += dilationHeight) { const wR = xR - xRCorner; for (let xC = xCMin; xC < xCMax; xC += dilationWidth) { const wC = xC - xCCorner; // For some reason, disable-next-line is not working // TODO(mattsoulanille): Remove this when switching to TS5. /* tslint:disable: no-unnecessary-type-assertion */ const pixel = xBuf.get(b, xR, xC, d); if (pixel > maxValue) { maxValue = pixel; if (flattenPositions) { maxPosition = includeBatchInIndex ? ((b * convInfo.inHeight + xR) * convInfo.inWidth + xC) * convInfo.inChannels + d : (xR * convInfo.inWidth + xC) * convInfo.inChannels + d; } else { maxPosition = wR * effectiveFilterWidth + wC; } } } } maxPositions.set(maxPosition, b, yR, yC, d); } } } } return maxPositions; } export function pool3d(xValues, xShape, dtype, strides, convInfo, poolType) { const strideDepth = convInfo.strideDepth; const strideHeight = convInfo.strideHeight; const strideWidth = convInfo.strideWidth; const dilationDepth = convInfo.dilationDepth; const dilationHeight = convInfo.dilationHeight; const dilationWidth = convInfo.dilationWidth; const effectiveFilterDepth = convInfo.effectiveFilterDepth; const effectiveFilterHeight = convInfo.effectiveFilterHeight; const effectiveFilterWidth = convInfo.effectiveFilterWidth; const padFront = convInfo.padInfo.front; const padTop = convInfo.padInfo.top; const padLeft = convInfo.padInfo.left; const initialValue = (poolType === 'max' ? Number.NEGATIVE_INFINITY : Number.POSITIVE_INFINITY); const output = buffer(convInfo.outShape, dtype); const outputVals = output.values; const outputBatchStrides = convInfo.outShape[1] * convInfo.outShape[2] * convInfo.outShape[3] * convInfo.outShape[4]; const outputDepthStrides = convInfo.outShape[2] * convInfo.outShape[3] * convInfo.outShape[4]; const outputRowStrides = convInfo.outShape[3] * convInfo.outShape[4]; const outputColStrides = convInfo.outShape[4]; for (let batch = 0; batch < convInfo.batchSize; ++batch) { const outputBatchOffset = batch * outputBatchStrides; const inputBatchOffset = batch * strides[0]; for (let channel = 0; channel < convInfo.inChannels; ++channel) { for (let yDepth = 0; yDepth < convInfo.outDepth; ++yDepth) { const xDepthCorner = yDepth * strideDepth - padFront; let xDepthMin = xDepthCorner; while (xDepthMin < 0) { xDepthMin += dilationDepth; } const xDepthMax = Math.min(convInfo.inDepth, effectiveFilterDepth + xDepthCorner); const outputDepthOffset = outputBatchOffset + yDepth * outputDepthStrides; for (let yRow = 0; yRow < convInfo.outHeight; ++yRow) { const xRowCorner = yRow * strideHeight - padTop; let xRowMin = xRowCorner; while (xRowMin < 0) { xRowMin += dilationHeight; } const xRowMax = Math.min(convInfo.inHeight, effectiveFilterHeight + xRowCorner); const outputRowOffset = outputDepthOffset + yRow * outputRowStrides; for (let yCol = 0; yCol < convInfo.outWidth; ++yCol) { const xColCorner = yCol * strideWidth - padLeft; let xColMin = xColCorner; while (xColMin < 0) { xColMin += dilationWidth; } const xColMax = Math.min(convInfo.inWidth, effectiveFilterWidth + xColCorner); // Shader code begins const outputColOffset = outputRowOffset + yCol * outputColStrides; let minMaxValue = initialValue; let avgValue = 0; let count = 0; for (let xDepth = xDepthMin; xDepth < xDepthMax; xDepth += dilationDepth) { const xDepthOffset = inputBatchOffset + xDepth * strides[1]; for (let xRow = xRowMin; xRow < xRowMax; xRow += dilationHeight) { const xRowOffset = xDepthOffset + xRow * strides[2]; for (let xCol = xColMin; xCol < xColMax; xCol += dilationWidth) { const xColOffset = xRowOffset + xCol * strides[3]; const pixel = xValues[xColOffset + channel]; if ((poolType === 'max' && pixel > minMaxValue)) { minMaxValue = pixel; } else if (poolType === 'avg') { avgValue += pixel; count++; } if (isNaN(minMaxValue)) { break; } } if (isNaN(minMaxValue)) { break; } } if (isNaN(minMaxValue)) { break; } } const outputOffset = outputColOffset + channel; outputVals[outputOffset] = poolType === 'avg' ? avgValue / Math.max(count, 1) : minMaxValue; } } } } } return output; } export function maxPool3dPositions(xBuf, convInfo) { const maxPositions = buffer(convInfo.outShape, 'int32'); const strideDepth = convInfo.strideDepth; const strideHeight = convInfo.strideHeight; const strideWidth = convInfo.strideWidth; const dilationDepth = convInfo.dilationDepth; const dilationHeight = convInfo.dilationHeight; const dilationWidth = convInfo.dilationWidth; const effectiveFilterDepth = convInfo.effectiveFilterDepth; const effectiveFilterHeight = convInfo.effectiveFilterHeight; const effectiveFilterWidth = convInfo.effectiveFilterWidth; const padFront = convInfo.padInfo.front; const padTop = convInfo.padInfo.top; const padLeft = convInfo.padInfo.left; for (let batch = 0; batch < convInfo.batchSize; ++batch) { for (let channel = 0; channel < convInfo.inChannels; ++channel) { for (let yDepth = 0; yDepth < convInfo.outDepth; ++yDepth) { const xDepthCorner = yDepth * strideDepth - padFront; let xDepthMin = xDepthCorner; while (xDepthMin < 0) { xDepthMin += dilationDepth; } const xDepthMax = Math.min(convInfo.inDepth, effectiveFilterDepth + xDepthCorner); for (let yRow = 0; yRow < convInfo.outHeight; ++yRow) { const xRowCorner = yRow * strideHeight - padTop; let xRowMin = xRowCorner; while (xRowMin < 0) { xRowMin += dilationHeight; } const xRowMax = Math.min(convInfo.inHeight, effectiveFilterHeight + xRowCorner); for (let yCol = 0; yCol < convInfo.outWidth; ++yCol) { const xColCorner = yCol * strideWidth - padLeft; let xColMin = xColCorner; while (xColMin < 0) { xColMin += dilationWidth; } const xColMax = Math.min(convInfo.inWidth, effectiveFilterWidth + xColCorner); // Shader code begins let maxValue = Number.NEGATIVE_INFINITY; let maxPosition = -1; for (let xDepth = xDepthMin; xDepth < xDepthMax; xDepth += dilationDepth) { const wDepth = xDepth - xDepthCorner; for (let xRow = xRowMin; xRow < xRowMax; xRow += dilationHeight) { const wRow = xRow - xRowCorner; for (let xCol = xColMin; xCol < xColMax; xCol += dilationWidth) { const wCol = xCol - xColCorner; const pixel = xBuf.get(batch, xDepth, xRow, xCol, channel); if (pixel >= maxValue) { maxValue = pixel; maxPosition = wDepth * effectiveFilterHeight * effectiveFilterWidth + wRow * effectiveFilterHeight + wCol; } } } } maxPositions.set(maxPosition, batch, yDepth, yRow, yCol, channel); } } } } } return maxPositions; } //# 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* @license\n * Copyright 2020 Google LLC. All Rights Reserved.\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n * =============================================================================\n */\n\nimport {backend_util, buffer, DataType, Rank, TensorBuffer, TypedArray} from '@tensorflow/tfjs-core';\n\nexport function pool(\n    xValues: TypedArray, xShape: number[], dtype: DataType, strides: number[],\n    convInfo: backend_util.Conv2DInfo,\n    poolType: 'max'|'avg'): TensorBuffer<Rank, DataType> {\n  const strideHeight = convInfo.strideHeight;\n  const strideWidth = convInfo.strideWidth;\n  const dilationHeight = convInfo.dilationHeight;\n  const dilationWidth = convInfo.dilationWidth;\n  const effectiveFilterHeight = convInfo.effectiveFilterHeight;\n  const effectiveFilterWidth = convInfo.effectiveFilterWidth;\n  const padTop = convInfo.padInfo.top;\n  const padLeft = convInfo.padInfo.left;\n\n  const initialValue =\n      (poolType === 'max' ? Number.NEGATIVE_INFINITY :\n                            Number.POSITIVE_INFINITY);\n\n  const output = buffer(convInfo.outShape, dtype);\n  const outputVals = output.values;\n\n  const outputBatchStrides =\n      convInfo.outShape[1] * convInfo.outShape[2] * convInfo.outShape[3];\n  const outputRowStrides = convInfo.outShape[2] * convInfo.outShape[3];\n  const outputColStrides = convInfo.outShape[3];\n\n  for (let b = 0; b < convInfo.batchSize; ++b) {\n    const outputBatchOffset = b * outputBatchStrides;\n    const inputBatchOffset = b * strides[0];\n    for (let d = 0; d < convInfo.inChannels; ++d) {\n      for (let yR = 0; yR < convInfo.outHeight; ++yR) {\n        const xRCorner = yR * strideHeight - padTop;\n        const xRMin = Math.max(0, xRCorner);\n        const xRMax =\n            Math.min(convInfo.inHeight, effectiveFilterHeight + xRCorner);\n        const outputRowOffset = outputBatchOffset + yR * outputRowStrides;\n        for (let yC = 0; yC < convInfo.outWidth; ++yC) {\n          const xCCorner = yC * strideWidth - padLeft;\n          const xCMin = Math.max(0, xCCorner);\n          const xCMax =\n              Math.min(convInfo.inWidth, effectiveFilterWidth + xCCorner);\n          let minMaxValue = initialValue;\n          let avgValue = 0;\n          let count = 0;\n          for (let xR = xRMin; xR < xRMax; xR += dilationHeight) {\n            const xROffset = inputBatchOffset + xR * strides[1];\n            for (let xC = xCMin; xC < xCMax; xC += dilationWidth) {\n              const xCOffset = xROffset + xC * strides[2];\n              const pixel = xValues[xCOffset + d];\n              if ((poolType === 'max' && pixel > minMaxValue)) {\n                minMaxValue = pixel;\n              } else if (poolType === 'avg') {\n                avgValue += pixel;\n                count++;\n              }\n            }\n            if (isNaN(minMaxValue)) {\n              break;\n            }\n          }\n          const outputOffset = outputRowOffset + yC * outputColStrides + d;\n          outputVals[outputOffset] =\n              poolType === 'avg' ? avgValue / count : minMaxValue;\n        }\n      }\n    }\n  }\n  return output;\n}\n\nexport function maxPoolPositions(\n    xValues: TypedArray, xShape: number[], dtype: DataType,\n    convInfo: backend_util.Conv2DInfo, flattenPositions = false,\n    includeBatchInIndex = false): TensorBuffer<Rank, 'int32'> {\n  const maxPositions = buffer(convInfo.outShape, 'int32');\n  const strideHeight = convInfo.strideHeight;\n  const strideWidth = convInfo.strideWidth;\n  const dilationHeight = convInfo.dilationHeight;\n  const dilationWidth = convInfo.dilationWidth;\n  const effectiveFilterHeight = convInfo.effectiveFilterHeight;\n  const effectiveFilterWidth = convInfo.effectiveFilterWidth;\n  const padTop = convInfo.padInfo.top;\n  const padLeft = convInfo.padInfo.left;\n\n  const xBuf = buffer(xShape, dtype, xValues);\n  for (let b = 0; b < convInfo.batchSize; ++b) {\n    for (let d = 0; d < convInfo.inChannels; ++d) {\n      for (let yR = 0; yR < convInfo.outHeight; ++yR) {\n        const xRCorner = yR * strideHeight - padTop;\n        let xRMin = xRCorner;\n        while (xRMin < 0) {\n          xRMin += dilationHeight;\n        }\n        // const xRMin = Math.max(0, xRCorner);\n        const xRMax =\n            Math.min(convInfo.inHeight, effectiveFilterHeight + xRCorner);\n        for (let yC = 0; yC < convInfo.outWidth; ++yC) {\n          const xCCorner = yC * strideWidth - padLeft;\n          let xCMin = xCCorner;\n          while (xCMin < 0) {\n            xCMin += dilationWidth;\n          }\n          const xCMax =\n              Math.min(convInfo.inWidth, effectiveFilterWidth + xCCorner);\n          let maxValue = Number.NEGATIVE_INFINITY;\n          let maxPosition = -1;\n\n          for (let xR = xRMin; xR < xRMax; xR += dilationHeight) {\n            const wR = xR - xRCorner;\n            for (let xC = xCMin; xC < xCMax; xC += dilationWidth) {\n              const wC = xC - xCCorner;\n              // For some reason, disable-next-line is not working\n              // TODO(mattsoulanille): Remove this when switching to TS5.\n              /* tslint:disable: no-unnecessary-type-assertion */\n              const pixel = xBuf.get(b, xR, xC, d) as number;\n              if (pixel > maxValue) {\n                maxValue = pixel as number;\n                if (flattenPositions) {\n                  maxPosition = includeBatchInIndex ?\n                      ((b * convInfo.inHeight + xR) * convInfo.inWidth + xC) *\n                              convInfo.inChannels +\n                          d :\n                      (xR * convInfo.inWidth + xC) * convInfo.inChannels + d;\n                } else {\n                  maxPosition = wR * effectiveFilterWidth + wC;\n                }\n              }\n            }\n          }\n          maxPositions.set(maxPosition, b, yR, yC, d);\n        }\n      }\n    }\n  }\n  return maxPositions;\n}\n\nexport function pool3d(\n    xValues: TypedArray, xShape: number[], dtype: DataType, strides: number[],\n    convInfo: backend_util.Conv3DInfo,\n    poolType: 'max'|'avg'): TensorBuffer<Rank, DataType> {\n  const strideDepth = convInfo.strideDepth;\n  const strideHeight = convInfo.strideHeight;\n  const strideWidth = convInfo.strideWidth;\n  const dilationDepth = convInfo.dilationDepth;\n  const dilationHeight = convInfo.dilationHeight;\n  const dilationWidth = convInfo.dilationWidth;\n  const effectiveFilterDepth = convInfo.effectiveFilterDepth;\n  const effectiveFilterHeight = convInfo.effectiveFilterHeight;\n  const effectiveFilterWidth = convInfo.effectiveFilterWidth;\n  const padFront = convInfo.padInfo.front;\n  const padTop = convInfo.padInfo.top;\n  const padLeft = convInfo.padInfo.left;\n\n  const initialValue =\n      (poolType === 'max' ? Number.NEGATIVE_INFINITY :\n                            Number.POSITIVE_INFINITY);\n\n  const output = buffer(convInfo.outShape, dtype);\n  const outputVals = output.values;\n\n  const outputBatchStrides = convInfo.outShape[1] * convInfo.outShape[2] *\n      convInfo.outShape[3] * convInfo.outShape[4];\n  const outputDepthStrides =\n      convInfo.outShape[2] * convInfo.outShape[3] * convInfo.outShape[4];\n  const outputRowStrides = convInfo.outShape[3] * convInfo.outShape[4];\n  const outputColStrides = convInfo.outShape[4];\n\n  for (let batch = 0; batch < convInfo.batchSize; ++batch) {\n    const outputBatchOffset = batch * outputBatchStrides;\n    const inputBatchOffset = batch * strides[0];\n    for (let channel = 0; channel < convInfo.inChannels; ++channel) {\n      for (let yDepth = 0; yDepth < convInfo.outDepth; ++yDepth) {\n        const xDepthCorner = yDepth * strideDepth - padFront;\n        let xDepthMin = xDepthCorner;\n        while (xDepthMin < 0) {\n          xDepthMin += dilationDepth;\n        }\n        const xDepthMax =\n            Math.min(convInfo.inDepth, effectiveFilterDepth + xDepthCorner);\n        const outputDepthOffset =\n            outputBatchOffset + yDepth * outputDepthStrides;\n        for (let yRow = 0; yRow < convInfo.outHeight; ++yRow) {\n          const xRowCorner = yRow * strideHeight - padTop;\n          let xRowMin = xRowCorner;\n          while (xRowMin < 0) {\n            xRowMin += dilationHeight;\n          }\n          const xRowMax =\n              Math.min(convInfo.inHeight, effectiveFilterHeight + xRowCorner);\n          const outputRowOffset = outputDepthOffset + yRow * outputRowStrides;\n          for (let yCol = 0; yCol < convInfo.outWidth; ++yCol) {\n            const xColCorner = yCol * strideWidth - padLeft;\n            let xColMin = xColCorner;\n            while (xColMin < 0) {\n              xColMin += dilationWidth;\n            }\n            const xColMax =\n                Math.min(convInfo.inWidth, effectiveFilterWidth + xColCorner);\n            // Shader code begins\n            const outputColOffset = outputRowOffset + yCol * outputColStrides;\n            let minMaxValue = initialValue;\n            let avgValue = 0;\n            let count = 0;\n            for (let xDepth = xDepthMin; xDepth < xDepthMax;\n                 xDepth += dilationDepth) {\n              const xDepthOffset = inputBatchOffset + xDepth * strides[1];\n              for (let xRow = xRowMin; xRow < xRowMax; xRow += dilationHeight) {\n                const xRowOffset = xDepthOffset + xRow * strides[2];\n                for (let xCol = xColMin; xCol < xColMax;\n                     xCol += dilationWidth) {\n                  const xColOffset = xRowOffset + xCol * strides[3];\n                  const pixel = xValues[xColOffset + channel];\n                  if ((poolType === 'max' && pixel > minMaxValue)) {\n                    minMaxValue = pixel;\n                  } else if (poolType === 'avg') {\n                    avgValue += pixel;\n                    count++;\n                  }\n                  if (isNaN(minMaxValue)) {\n                    break;\n                  }\n                }\n                if (isNaN(minMaxValue)) {\n                  break;\n                }\n              }\n              if (isNaN(minMaxValue)) {\n                break;\n              }\n            }\n            const outputOffset = outputColOffset + channel;\n            outputVals[outputOffset] = poolType === 'avg' ?\n                avgValue / Math.max(count, 1) :\n                minMaxValue;\n          }\n        }\n      }\n    }\n  }\n\n  return output;\n}\n\nexport function maxPool3dPositions(\n    xBuf: TensorBuffer<Rank, DataType>,\n    convInfo: backend_util.Conv3DInfo): TensorBuffer<Rank, DataType> {\n  const maxPositions = buffer(convInfo.outShape, 'int32');\n  const strideDepth = convInfo.strideDepth;\n  const strideHeight = convInfo.strideHeight;\n  const strideWidth = convInfo.strideWidth;\n  const dilationDepth = convInfo.dilationDepth;\n  const dilationHeight = convInfo.dilationHeight;\n  const dilationWidth = convInfo.dilationWidth;\n  const effectiveFilterDepth = convInfo.effectiveFilterDepth;\n  const effectiveFilterHeight = convInfo.effectiveFilterHeight;\n  const effectiveFilterWidth = convInfo.effectiveFilterWidth;\n  const padFront = convInfo.padInfo.front;\n  const padTop = convInfo.padInfo.top;\n  const padLeft = convInfo.padInfo.left;\n\n  for (let batch = 0; batch < convInfo.batchSize; ++batch) {\n    for (let channel = 0; channel < convInfo.inChannels; ++channel) {\n      for (let yDepth = 0; yDepth < convInfo.outDepth; ++yDepth) {\n        const xDepthCorner = yDepth * strideDepth - padFront;\n        let xDepthMin = xDepthCorner;\n        while (xDepthMin < 0) {\n          xDepthMin += dilationDepth;\n        }\n        const xDepthMax =\n            Math.min(convInfo.inDepth, effectiveFilterDepth + xDepthCorner);\n        for (let yRow = 0; yRow < convInfo.outHeight; ++yRow) {\n          const xRowCorner = yRow * strideHeight - padTop;\n          let xRowMin = xRowCorner;\n          while (xRowMin < 0) {\n            xRowMin += dilationHeight;\n          }\n          const xRowMax =\n              Math.min(convInfo.inHeight, effectiveFilterHeight + xRowCorner);\n          for (let yCol = 0; yCol < convInfo.outWidth; ++yCol) {\n            const xColCorner = yCol * strideWidth - padLeft;\n            let xColMin = xColCorner;\n            while (xColMin < 0) {\n              xColMin += dilationWidth;\n            }\n            const xColMax =\n                Math.min(convInfo.inWidth, effectiveFilterWidth + xColCorner);\n\n            // Shader code begins\n            let maxValue = Number.NEGATIVE_INFINITY;\n            let maxPosition = -1;\n\n            for (let xDepth = xDepthMin; xDepth < xDepthMax;\n                 xDepth += dilationDepth) {\n              const wDepth = xDepth - xDepthCorner;\n              for (let xRow = xRowMin; xRow < xRowMax; xRow += dilationHeight) {\n                const wRow = xRow - xRowCorner;\n                for (let xCol = xColMin; xCol < xColMax;\n                     xCol += dilationWidth) {\n                  const wCol = xCol - xColCorner;\n                  const pixel = xBuf.get(batch, xDepth, xRow, xCol,\n                                         channel) as number;\n                  if (pixel >= maxValue) {\n                    maxValue = pixel as number;\n                    maxPosition =\n                        wDepth * effectiveFilterHeight * effectiveFilterWidth +\n                        wRow * effectiveFilterHeight + wCol;\n                  }\n                }\n              }\n            }\n\n            maxPositions.set(maxPosition, batch, yDepth, yRow, yCol, channel);\n          }\n        }\n      }\n    }\n  }\n\n  return maxPositions;\n}\n"]}